2004

592 | Chapter 21 Create Layouts
Scale locking locks the scale that you set for the selected viewport. Once the
scale is locked, you can continue to modify the geometry in the viewport
without affecting the viewport scale. If you turn a viewport's scale locking on,
most of the viewing commands, such as
VPOINT, DVIEW, 3DORBIT, PLAN, and
VIEW, no longer function in that viewport.
Viewport scale locking is also available for nonrectangular viewports. To lock
a nonrectangular viewport, you must perform an extra step in the Properties
palette to select the viewport object rather than the viewport clipping
boundary.
To turn on scale locking in a viewport
1 In the layout, double-click the viewport whose scale you want to lock.
2 In the Properties palette, do one of the following:
■ If you selected a rectangular viewport, select Display Locked, and then
select Yes.
■ If you selected a nonrectangular viewport, first click All (2) and choose
Viewport (1). Then select Display Locked, and select Yes.
The current viewport's scale is locked. If you change the zoom factor in the
viewport, only paper space objects are affected.
Standard toolbar
Command line
PROPERTIES
Shortcut menu Select the viewport, right-click in the drawing area, and
then choose Properties.
Control Visibility in Layout Viewports
You can control the visibility of objects in layout viewports using several
methods. These methods are useful for limiting screen regeneration and for
emphasizing or hiding different elements of your drawing.
Screen Objects in Layout Viewports
Screening refers to applying less ink to an object when it is plotted. The
object appears dimmer on the screen and on the plotted paper. Screening can
be used to help differentiate objects in a drawing without changing the
objects' color properties. To assign a screening value to an object, you must
assign a plot style to the object and then define the screening value in that
plot style.